please help

1. Given the following bill of material If the demand for product A is 40 units, and there are 10 units of B on hand and none of C, Calculate: Answer: a} How many levels does this product structure show? 2 Marks 1)) How many units of part D will be needed? 2 Marks c) How many units of part F will be needed? 2 Marks Show each step in your calculations for parts b) and c) in area below (mandatory): 6 Marks